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#!/usr/bin/perl
#
# Creates a blank MS-DOS formatted hard disk image
#
use Fcntl;
use Errno;
use Cwd;
sub absolute_path($) {
my($f) = @_;
my($c);
return $f if ( $f =~ /^\// );
$c = cwd();
$c = '' if ( $c eq '/' );
return $c.'/'.$f;
}
%opt = ();
@args = ();
for $a ( @ARGV ) {
if ( $a =~ /^\-/ ) {
$opt{$'} = 1;
} else {
push(@args, $a);
}
}
($file,$c,$h,$s) = @args;
$c += 0; $h += 0; $s += 0;
if ( !$file || $c < 1 || $c > 1024 ||
$h < 1 || $h > 256 || $s < 1 || $s > 63 ) {
print STDERR "Usage: $0 [-o] file c h s (max: 1024 256 63)\n";
print STDERR " -o print filesystem offset to stdout\n";
exit 1;
}
$cylsize = $h*$s*512;
sysopen(OUTPUT, $file, O_CREAT|O_RDWR|O_TRUNC, 0666)
or die "$0: Cannot open: $file\n";
# Print the MBR and partition table
$mbr = '';
while ( $line = <DATA> ) {
chomp $line;
foreach $byte ( split(/\s+/, $line) ) {
$mbr .= chr(hex($byte));
}
}
if ( length($mbr) > 446 ) {
die "$0: Bad MBR code\n";
}
$mbr .= "\0" x (446 - length($mbr));
print OUTPUT $mbr;
# Print partition table
$psize = $c*$h*$s-$s;
$bhead = ($h > 1) ? 1 : 0;
$bsect = 1;
$bcyl = ($h > 1) ? 0 : 1;
$ehead = $h;
$esect = $s + (($c & 0x300) >> 2);
$ecyl = $c & 0xff;
if ( $psize > 65536 ) {
$fstype = 0x06;
} else {
$fstype = 0x04;
}
print OUTPUT pack("CCCCCCCCVV", 0x80, $bhead, $bsect, $bcyl, $fstype,
$ehead, $esect, $ecyl, $s, $psize);
print OUTPUT "\0" x 48;
print OUTPUT "\x55\xaa";
# Output blank file
$totalsize = $c*$h*$s;
$tracks = $c*$h;
$track = "\0" x (512*$s);
# Print fractional track
print OUTPUT "\0" x (512 * ($s-1));
for ( $i = 1 ; $i < $tracks ; $i++ ) {
print OUTPUT $track;
}
# Print mtools temp file
$n = 0;
while ( !defined($tmpdir) ) {
$tmpdir = "/tmp/mkdiskimage.$$.".($n++);
if ( !mkdir($tmpdir, 0700) ) {
die "$0: Failed to make temp directory: $tmpdir\n"
if ( $! != EEXIST );
undef $tmpdir;
}
}
$cfgfile = $tmpdir.'/mtools.conf';
$imglink = $tmpdir.'/disk.img';
die "$0: Failed to create symlink $imglink\n"
if ( !symlink(absolute_path($file), $imglink) );
$offset = $s*512;
open(MCONFIG, "> ${cfgfile}") or die "$0: Cannot make mtools config\n";
print MCONFIG "drive z:\n";
print MCONFIG "file=\"${imglink}\"\n";
print MCONFIG "cylinders=${c}\n";
print MCONFIG "heads=${h}\n";
print MCONFIG "sectors=${s}\n";
print MCONFIG "offset=${offset}\n";
print MCONFIG "mformat_only\n";
close(MCONFIG);
# Output the filesystem offset to stdout if appropriate
if ( $opt{'o'} ) {
print $offset, "\n";
}
$ENV{'MTOOLSRC'} = $cfgfile;
system('mformat', 'z:');
# Clean up in /tmp
unlink($cfgfile);
unlink($imglink);
rmdir($tmpdir);
seek(OUTPUT, $s*512+0x36, 0);
read(OUTPUT, $fsname, 8);
# FAT12: adjust partition type
if ( $fsname eq 'FAT12 ' ) {
$fstype = 0x01;
}
seek(OUTPUT, 446+4, 0);
print OUTPUT pack("C", $fstype);
exit 0;
__END__
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